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<?php namespace Chekote\NounStore; |
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use InvalidArgumentException; |
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class Key |
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{ |
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use Singleton; |
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const ORDINAL_ST = 'st'; |
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const ORDINAL_ND = 'nd'; |
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const ORDINAL_RD = 'rd'; |
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const ORDINAL_TH = 'th'; |
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protected static $ordinals = [ |
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0 => self::ORDINAL_TH, |
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1 => self::ORDINAL_ST, |
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2 => self::ORDINAL_ND, |
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3 => self::ORDINAL_RD, |
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4 => self::ORDINAL_TH, |
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5 => self::ORDINAL_TH, |
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6 => self::ORDINAL_TH, |
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7 => self::ORDINAL_TH, |
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8 => self::ORDINAL_TH, |
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9 => self::ORDINAL_TH, |
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]; |
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/** |
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* Builds a key from it's separate key and index values. |
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* |
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* @example buildKey("Item", null): "Item" |
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* @example buildKey("Item", 0): "1st Item" |
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* @example buildKey("Item", 1): "2nd Item" |
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* @example buildKey("Item", 2): "3rd Item" |
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* |
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* @param string $key The key to check. |
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* @param int|null $index The index (zero indexed) value for the key. If not specified, the method |
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* will not add an index notation to the key. |
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* @throws InvalidArgumentException if $index is less than -1. Note: It should really be zero or higher, but this |
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* method does not assert that. The error is bubbling up from getOrdinal() |
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* @return string the key with the index, or just the key if index is null. |
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*/ |
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public function build($key, $index) |
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{ |
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if ($index === null) { |
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return $key; |
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} |
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$nth = $index + 1; |
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return $nth . $this->getOrdinal($nth) . ' ' . $key; |
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} |
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/** |
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* Provides the ordinal notation for the specified nth number. |
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* |
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* @param int $nth the number to determine the ordinal for |
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* @throws InvalidArgumentException if $nth is not a positive number. |
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* @return string the ordinal |
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*/ |
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public function getOrdinal($nth) |
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{ |
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if ($nth < 0) { |
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throw new InvalidArgumentException('$nth must be a positive number'); |
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} |
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return $nth > 9 && $nth < 20 ? self::ORDINAL_TH : self::$ordinals[substr($nth, -1)]; |
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} |
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/** |
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* Parses a key into the separate key and index value. |
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* |
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* @example parseKey("Item"): ["Item", null] |
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* @example parseKey("1st Item"): ["Item", 0] |
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* @example parseKey("2nd Item"): ["Item", 1] |
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* @example parseKey("3rd Item"): ["Item", 2] |
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* |
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* @param string $key the key to parse. |
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* @throws InvalidArgumentException if the key syntax is invalid. |
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* @return array a tuple, the 1st being the key with the nth removed, and the 2nd being the |
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* index that the nth translates to, or null if no nth was specified. |
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*/ |
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public function parse($key) |
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{ |
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if (!preg_match("/^(([1-9][0-9]*)(?:st|nd|rd|th) )?([^']+)$/", $key, $matches)) { |
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throw new InvalidArgumentException('Key syntax is invalid'); |
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} |
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// @todo use null coalescing operator when upgrading to PHP 7 |
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$index = isset($matches[2]) && $matches[2] !== '' ? $matches[2] - 1 : null; |
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$key = $matches[3]; |
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return [$key, $index]; |
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} |
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/** |
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* Resolves an index and parsed nth value to an index. |
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* |
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* Ensures that if both an index and parsed nth value are provided, that they are equivalent. If only one is |
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* provided, then the appropriate index will be returned. e.g. if an index is provided, it is returned as-is, as |
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* it is already an index. If an nth is provided, it will be returned decremented by 1. |
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* |
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* @param int|null $index the index to process |
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* @param int|null $nth the nth to process |
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* @throws InvalidArgumentException if both an $index and $key are provided, but the $key contains an nth value |
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* that does not match the index. |
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* @throws InvalidArgumentException if nth is not null and is less than 1 |
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* @return int the resolved index. |
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*/ |
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protected function resolveIndex($index, $nth) |
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{ |
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// If we don't have an nth, there's nothing to process. We'll just return the $index, even if it's null. |
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if ($nth === null) { |
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return $index; |
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} |
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$decrementedNth = $nth - 1; |
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// If both index and nth are provided, but they aren't equivalent, we need to error out. |
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if ($index !== null && $index !== $decrementedNth) { |
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throw new InvalidArgumentException("index $index was provided with nth $nth, but they are not equivalent"); |
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} |
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if ($decrementedNth < 0) { |
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throw new InvalidArgumentException('nth must be equal to or larger than 1'); |
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} |
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return $decrementedNth; |
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} |
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} |
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Chekote /
noun-store
